Diffusion in rare-gas liquids : an experimental study
Date
1981
Authors
Srinivasan, Kandadai
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Abstract
This thesis describes the design and development of
an apparatus for measuring the diffusion coefficients of cryogenic
liquids. The diaphragm cell method is used. The experimental
apparatus has a facility for the continuous monitoring of a radioactive
tracer which is diffusing across a sintered stainless steel diaphragm.
A scintillation counter assembly consisting of a cesium iodide crystal,
a lucite light guide and a photomultiplier tube is used for this purpose.
A temperature control method is incorporated which is capable of maintaining
a set temperature to within ± 0.03 K in space and time.
Modified equations for the diaphragm cell are derived
for the case of continuous monitoring. It is shown that neither the
initial concentrations of the two compartments of the cell nor the
exact starting time of diffusion are necessary to compute the diffusion
coefficient.
The apparatus is used to measure the tracer diffusion
coefficients of krypton in liquid argon over a temperature range of
85 - 103 K. The present data are discussed in relation to some
other experimental and computer simulation results.
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Thesis (PhD)
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